Fitting Flex Hoof Boot on hind foot

Watch how the correct boot size is determined for this hind foot, and how the Flex Boot is fitted on.
The first boot shell we try on is too big and rotates too much on the foot. The 120 size which we try on next is clearly too small.
But this hoof was due a trim so we trimmed the hoof and then try the 130 size on again, this time with a pad inside the boot. This turns out to be a very good fit as you can see in the video.
Now that the correct size shell is identified, we try on the entire boot. This is size 130 FlexHorse boot with a pad inside. As you can see, the boot doesn't rotate on the hoof and stays on extremely well.